Portable sink



FIG. 1 is a front perspective view of a portable sink of the present design;

FIG. 2 is a front elevational view of a portable sink of the present design;

FIG. 3 is a rear elevational view of a portable sink of the present design;

FIG. 4 is a side view of a first side of a portable sink of the present design;

FIG. 5 is a side view of a second side of a portable sink of the present design;

FIG. 6 is a top view of a portable sink of the present design;

FIG. 7 is a bottom view of a portable sink of the present design; and,

FIG. 8 is a front elevational view of a portable sink of the present design in a closed orientation. 

The ornamental design for a portable sink, as shown and described. 